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Bementite

Type Locality
Trotter Mine (Lehigh Mine), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Mineral Data
Mn7Si6O15(OH)8
Strunz: 
9.EE.05
Physical Properties
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
6.0
Tenacity: 
flexible